Function InjectDll

IntelPresentMon/FlashInjector/LibraryInject.cpp:58–103

    }

    static void InjectDll(const HANDLE hProcess, const std::filesystem::path& dllPath)
    {
        auto  absDllPath = std::filesystem::absolute(dllPath).string();
        auto  remoteMemSize = absDllPath.size() + 1; // +1 to account for null character 
        auto* pRemoteMem = VirtualAllocEx(hProcess, NULL, remoteMemSize, MEM_COMMIT, PAGE_READWRITE);

        if (pRemoteMem == NULL)
        {
            auto error = GetLastError();
            LOGE << "Could not allocate memory in target process. Error: " << win::GetErrorDescription(error) << std::endl;
            exit(1);
        }

        if (!WriteProcessMemory(hProcess, pRemoteMem, absDllPath.c_str(), remoteMemSize, NULL))
        {
            auto error = GetLastError();
            LOGE << "WriteProcessMemory failed. Error: " << win::GetErrorDescription(error) << std::endl;
            exit(1);
        }
        FlushInstructionCache(hProcess, pRemoteMem, remoteMemSize);

        HMODULE hKernel32 = GetModuleHandle("Kernel32");
        HANDLE hRemoteThread = CreateRemoteThread(
            hProcess, 
            NULL, 
            0, 
            reinterpret_cast<LPTHREAD_START_ROUTINE>(GetProcAddress(hKernel32, "LoadLibraryA")), 
            pRemoteMem,
            0, 
            NULL
        );

        if (hRemoteThread == NULL)
        {
            auto error = GetLastError();
            LOGE << "Could not create remote thread in target process. Error: " << win::GetErrorDescription(error);
            LOGE << "Tip: Check bit-ness of the application and DXGIOverlay.exe." << std::endl;
            VirtualFreeEx(hProcess, pRemoteMem, 0, MEM_RELEASE);
            exit(1);
        }

        WaitForSingleObject(hRemoteThread, INFINITE);
        CloseHandle(hRemoteThread);

        VirtualFreeEx(hProcess, pRemoteMem, 0, MEM_RELEASE);
    }

    void Attach(uint32_t processId, const std::filesystem::path& dllPath)
    {